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  • perl solution have problem with multi line: test it with this output => echo -e "BEGIN/*comment*/ COMMAND /*com\nment*/END" Commented Jul 21, 2016 at 14:18
  • @Babby, works for me. I've added a multi-line comment and the resulting output in my test case. Commented Jul 21, 2016 at 14:28
  • The best thing to compare to nowadays would be gcc -std=c11 -E -P (-ansi is just another name for -std=c90). Commented Jul 21, 2016 at 17:16
  • @zwol, the idea is to be able to handle code written for any C/C++ standard (c90, c11 or other). Strictly speaking, it's not possible (see my 2nd contrived example). The code still tries to handle C90 constructs (like ??'), hence we compare with cpp -ansi for those and C99/C11... one (like // xxx), hence we compare with cpp (or cpp -std=c11...) Commented Jul 21, 2016 at 17:29
  • @zwol, I've split the test case in an attempt to clarify a bit. It looks like trigraphs are still in C11, so my second test case is not standard C anyway. Commented Jul 21, 2016 at 17:47